<s>
Subtext	B-Language
is	O
a	O
moderately	O
visual	B-Language
programming	I-Language
language	I-Language
and	O
environment	O
,	O
for	O
writing	O
application	B-Application
software	I-Application
.	O
</s>
<s>
It	O
uses	O
live	O
text	O
,	O
similar	O
to	O
what	O
occurs	O
in	O
spreadsheets	B-Application
as	O
users	O
update	O
cells	O
,	O
for	O
frequent	O
feedback	O
.	O
</s>
<s>
Subtext	B-Language
was	O
created	O
by	O
Jonathan	O
Edwards	O
who	O
submitted	O
a	O
paper	O
on	O
the	O
language	O
to	O
OOPSLA	O
.	O
</s>
<s>
Early	O
video	O
previews	O
of	O
the	O
Subtext	B-Language
environment	O
were	O
released	O
circa	O
2006	O
,	O
which	O
demonstrated	O
the	O
semantics	O
of	O
Subtext	B-Language
programs	O
,	O
and	O
the	O
close	O
integration	O
with	O
the	O
Subtex	O
environment	O
and	O
runtime	O
.	O
</s>
<s>
Subtext	B-Language
programs	O
are	O
declared	O
and	O
manipulated	O
(	O
or	O
mutated	O
)	O
by	O
adding	O
and	O
linking	O
elements	O
of	O
various	O
types	O
to	O
a	O
syntax	O
tree	O
,	O
and	O
entering	O
in	O
values	O
or	O
names	O
as	O
necessary	O
,	O
as	O
opposed	O
to	O
typing	O
out	O
textual	O
programs	O
.	O
</s>
<s>
Due	O
to	O
the	O
design	O
of	O
the	O
Subtext	B-Language
language	O
and	O
environment	O
,	O
there	O
is	O
no	O
distinction	O
between	O
a	O
program	O
's	O
representation	O
and	O
its	O
execution	O
.	O
</s>
<s>
Like	O
spreadsheets	B-Application
,	O
Subtext	B-Language
programs	O
are	O
live	O
executions	O
within	O
an	O
environment	O
and	O
runtime	O
,	O
and	O
programming	O
is	O
direct	O
manipulation	O
of	O
these	O
executions	O
via	O
a	O
graphical	B-Application
environment	I-Application
.	O
</s>
<s>
Unlike	O
typical	O
functional	B-Language
programming	I-Language
languages	I-Language
,	O
Subtext	B-Language
has	O
simple	O
semantics	O
and	O
is	O
easily	O
applicable	O
to	O
reactive	O
systems	O
that	O
require	O
mutable	O
state	O
,	O
I/O	O
,	O
and	O
concurrency	O
,	O
under	O
a	O
model	O
known	O
as	O
"	O
Reactive	O
Programming	O
"	O
.	O
</s>
<s>
Console	B-Application
input	O
(	O
"	O
invocations	O
"	O
)	O
can	O
be	O
utilized	O
via	O
data	O
flow	O
within	O
a	O
Subtext	B-Language
program	O
,	O
allowing	O
users	O
to	O
manipulate	O
values	O
interactively	O
.	O
</s>
<s>
A	O
continuation	O
and	O
subset	O
of	O
the	O
Subtext	B-Language
language	O
using	O
other	O
principles	O
,	O
is	O
Coherence	O
,	O
an	O
experimental	O
programming	O
language	O
and	O
environment	O
,	O
which	O
uses	O
a	O
new	O
model	O
of	O
change-driven	O
computation	O
called	O
"	O
Coherent	O
reaction	O
"	O
,	O
to	O
coordinate	O
the	O
effects	O
and	O
side-effects	O
of	O
programs	O
interactively	O
as	O
they	O
are	O
being	O
developed	O
.	O
</s>
<s>
The	O
language	O
is	O
specialized	O
for	O
interactive	O
application	B-Application
software	I-Application
,	O
and	O
is	O
being	O
designed	O
by	O
the	O
creator	O
of	O
Subtext	B-Language
,	O
Jonathan	O
Edwards	O
,	O
who	O
reports	O
upon	O
its	O
development	O
by	O
publishing	O
white	O
papers	O
.	O
</s>
